Perhaps you should try some spelling variations:
thanh vang » thanh van, thanh hang, thanh hoang
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
vang cua » mang cua, hang cua, tang cua
qua ban » cua ban
cua tre » cua te, cuu tre, cua triet
ky tang » ky nang, ky dang, kho tang
ky sang » ky nang, ky dang, duy sang
van ca » van cau, van cua, dan ca

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ky sang) OR (ky tang)) ma hoa. hieu van ca ((qua ban) or (qua quan)) thanh vang cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky sang) OR (ky tang)) ma hoa. hieu van ca ((qua ban) OR (qua quan)) thanh vang cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky sang) OR (ky tang)) ma hoa. hieu van ca ((qua ban) or (qua quan)) thanh vang cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky sang) OR (ky tang)) ma hoa. hieu van ca ((qua ban) or (qua quan)) thanh vang cua tre*.